Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fe96e420329076…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 19:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c324aff3ea469c64052829c183dd8b2 SHA-1: a5095dbd656058b39405881027850c5c84abd8e3 SHA-256: e8fe96e42032907624fc124a4f34d457db991e55f1c49f571441795527daaaab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=advertising+industry+in+malaysia+pdf
    • http://randoquad72.fr/userfiles/file/tupamigipexebadi.pdf
    • http://cpgny.com/userfiles/files/83570633491.pdf
    • http://haithuanphat.com/uploads/files/25266938939.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/tavufoxelafog.pdf
    • https://preprodpcb.com/userfiles/files/dezasekarugalegakit.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/20094535086.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161290022556f3---luludatupibolemajifo.pdf
    • https://amgaa.org/temp//files/50726821185.pdf
    • http://terezmisszio.eu/files/file/sizinifezojutajitapuruno.pdf
    • http://daieimotors.com/js/upload/files/savozakaru.pdf
    • https://firsatoyun.com/calisma2/files/uploads/gurigutuxagisudawoxobobo.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4ac67a8b---24292084569.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/33c6cc3abf6d66d3c0d4c4b34708c47f/42403594042.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/801ecbd52c8882a23464011d600eb570/83796874342.pdf
    • https://autoroman-service.ro/imagini_ws/33219931531.pdf
    • http://siamsankyo.com/Uploads/file/93505096642.pdf
    • http://mikllc.mn/uploads/files/zimukiwipawakuwi.pdf
    • https://m3csrl.com/file/nilaxabadukiwixokazawus.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160afa29903852---nerekelopudawuba.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16113e84670036---40904629796.pdf
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/bipenaladijizironiba.pdf
    • http://marathon-gexin.com/Uploadfiles/files/dunuwowuzenaratatun.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4b16a02e040cb49344b6257f960ec7ef/netifodete.pdf
    • http://akkoryazilim.com/userfiles/file/16212730936.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/43499871460.pdf
    • https://studiorampinelli.com/file/78692488194.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8af.bin
1cef3f8f799c0ec2dfd0a468a287c6b1973e20a00c6648b9b87d281c1dcc5e2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 18372 bytes
font_01_sfnt_off00010811.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 16792 bytes
font_02_sfnt_off00012028.bin
4ee541773a05beb414e07de2726c20b9e6099ae00b89d38cb80ba0669e55df5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 10980 bytes